Listen to this Iron Maiden song called "Afraid to Shoot Strangers" at about 2:43 (Iron Maiden fans will probably recognize the riff). This sounds very simple to me, but I don't know how they did it. I tried turning on the distortion on my amp, but it doesn't sound right. How can I reproduce this effect?
For this classic sound you need a metal pedal and an echo or delay. Also you really need another guitarist- Maiden love their dual melody/harmony lines.
Some more detail:
Adrian always used Marshalls, with the treble slightly higher than the bass and mid, and the gain cranked up high.
Delay of about 300ms, with a medium feedback level, and a fair bit of Reverb.